LONDON — Chinese diver Wu Minxia’s celebrations at winning a third Olympic gold medal were cut short after her family revealed the details of a devastating secret they had kept for several years.

Wu’s parents decided to withhold news of both the death of her grandparents and of her mother’s long battle with breast cancer until after she won the 3-meter springboard in London so as to not interfere with her diving career.

“It was essential to tell this white lie,” said her father Wu Yuming.

The story of Wu’s family secret has generated huge discussion in China, where the pursuit of success has been chased by the government-backed sports national sports program with unshakeable zeal over the past two decades.

Now there seems to be a backlash against the win-at-all-costs mentality after the revelations about Wu followed fierce criticism from a national newspaper when a 17-year-old weightlifter failed to medal.